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Azeotropic and azeotrope-like compositions of methyl perfluoroheptene ethers and trans-1,2-dichloroethylene and uses thereof

a technology of methyl perfluoroheptene and composition, which is applied in the preparation of detergent mixture composition, detergent compounding agent, liquid soap, etc., can solve the problems of inability to meet the requirements of use,

Active Publication Date: 2013-04-02
THE CHEMOURS CO FC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In cleaning apparatuses, including vapor degreasing and vapor defluxing equipment, compositions may be lost during operation through leaks in shaft seals, hose connections, soldered joints and broken lines.
If the composition is not a pure component, the composition may change when leaked or discharged to the atmosphere from the equipment, which may cause the composition remaining in the equipment to exhibit unacceptable performance.
While boiling point, flammability and solvent power characteristics can often be adjusted by preparing solvent mixtures, these mixtures are often unsatisfactory because they fractionate to an undesirable degree during use.
Such solvent mixtures also fractionate during solvent distillation, which makes it virtually impossible to recover a solvent mixture of the original composition.
While hydrofluorocarbons (HFCs) have been proposed as replacements for the previously used CFC solvents in drying or dewatering applications, many HFCs have limited solvency for water.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Dew Point and Bubble Point Pressures for Mixtures of MPHE and t-DCE

[0063]The dew point and bubble point pressures for compositions disclosed herein were calculated from measured and calculated thermodynamic properties. The near azeotrope range is indicated by the minimum and maximum concentration of MPHE (mole percent, mol %) for which the difference in dew point and bubble point pressures is less than or equal to 3%, based on the bubble point pressure. The results are summarized in Table 1.

[0064]

TABLE 1Near azeotropecompositions,Temperature,mol % MPHE° C.MinimumMaximum 00.12.3 200.13.247.6-47.9*0.14.7 600.15.21000.16.91400.18.61600.19.7*at 1 atm. Pressure.

example 2

MPHE and Trans-1,2-dichloroethylene Azeotrope-Like Mixtures

[0065]An ebulliometer apparatus was used to determine the azeotrope-like range of the MPHE and trans-1,2-dichloroethylene mixtures. The apparatus consisted of a flask with thermocouple, heating mantle and condenser. A side neck on the flask was fitted with a rubber septum to allow the addition of one component into the flask. Initially the flask contained 100% trans-1,2-dichloroethylene, and the liquid was heated gradually until reflux and the boiling temperature was recorded to the nearest 0.1° C. Additions of MPHE were made into the flask through the side neck, at approximately 1 or 2 wt % increments. Each time an addition of MPHE was made, the flask boiling temperature was allowed to stabilize and then recorded. The MPHE was added to the trans-1,2-dichloroethylene mixture in the flask until a composition of approximately 50 wt % MPHE and 50 wt % trans-1,2-dichloroethylene was present. A similar experiment began with 100% ...

example 3

MPHE & 1,2-trans-dichloroethylene azeotrope

[0068]A mixture which contained 2.4 mole % MPHE and 97.6 mole % 1,2-trans-dichloroethylene (t-DCE) was prepared. The mixture was distilled in a 5-plate Oldershaw distillation column at 1 atmosphere pressure using a 10:1 reflux to take-off ratio. Head and flask temperatures were read directly to 1° C. Distillate samples were taken at 30 minute intervals throughout the distillation for determination of composition by gas chromatography. The results are shown in Table 3.

[0069]

TABLE 3TemperatureDistillate CompositionDistillation Cut(° C.)MPHEt-DCE(vol %)HeadFlask(mole %)(mole %) 046472.4%97.6%1046471.0%99.0%2046470.8%99.2%3046470.9%99.1%4046471.0%99.0%5046471.0%99.0%6046481.1%98.9%8046481.7%98.3%Heel7.7%92.3%

[0070]Throughout the distillation, especially between the cuts at 10% and 60%, the distillation temperatures and compositions remained remarkably constant, which indicates the presence of an azeotrope. On average the composition of 1.0±0.1 ...

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Abstract

The present disclosure provides azeotropic and azeotrope-like compositions comprised of methylperfluoroheptene ethers and trans-1,2-dichloroethylene. The present disclosure also provides for methods of use for the azeotropic and azeotrope-like compositions.

Description

BACKGROUND INFORMATION[0001]1. Field of the Disclosure[0002]The present disclosure is in the field of methyl perfluoroheptene ether compositions. These compositions are azeotropic or azeotrope-like and are useful in cleaning applications as a defluxing agent and for removing oils or residues from a surface.[0003]2. Description of the Related Art[0004]Flux residues are always present on microelectronics components assembled using rosin flux. As modern electronic circuit boards evolve toward increased circuit and component densities, thorough board cleaning after soldering becomes a critical processing step. After soldering, the flux-residues are often removed with an organic solvent. De-fluxing solvents should be non-flammable, have low toxicity and have high solvency power, so that the flux and flux-residues can be removed without damaging the substrate being cleaned. For proper operation in use, microelectronic components must be cleaned of flux residues, oils and greases, and part...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C11D7/50
CPCC11D7/5063C23G5/032C11D11/0047C11D11/0041C23G5/02806C11D7/50C11D11/00
Inventor BARTELT, JOAN ELLENKNAPP, JEFFREY P.
Owner THE CHEMOURS CO FC LLC
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